Table 1.

Themes and subthemes resulting from the thematic analysis

Theme	Subthemes
Involvement of GPs in the SDM process	Moments to engage in conversations about treatment
Involvement of GPs in the SDM process	Initiative for the GP–patient conversation

Supporting role of GPs in the SDM process	Checking the quality of a decision (high-quality decision: conscious, informed, and appropriate)	Checking choice awareness Checking if decision isinformed Checking if decision is aligned with patient’s values
	Complementing SDM (adding to the decision-making process to reach a high-quality decision)	Increasing choice awareness Clarifying and adding information Exploring values and supporting preference construction
	Enabling SDM (organising activities to ensure reaching a high-quality decision)	Acting as a patient advocate Preparing upcoming conversations with the oncologist

Interprofessional SDM: GPs’ added value	The unique position of GP in the healthcare system
	Additional and different conversations about treatment
	Primary healthcare provider in the terminal stage

Requirements for fulfilling a role in the SDM process	Collaboration with the oncologist
	Information about cancer and treatment options
	Time to engage in conversations about treatment
	Trusting relationship with patient
	Patient-centred communication